U.S. and Chinese trade delegates, including Treasury Secretary Steven Mnuchin, United States Trade Representative Robert Lighthizer and Chinese Vice Premier Liu He, pose for a family photo at the Xijiao Conference Center in Shanghai, China, July 31, 2019. Ng Han Guan/Pool via REUTERS

U.S. and Chinese trade delegates, including Treasury Secretary Steven Mnuchin, United States Trade Representative Robert Lighthizer and Chinese Vice Premier Liu He, pose for a family photo at the Xijiao Conference Center in Shanghai, China, July 31, 2019. Ng Han Guan/Pool via REUTERS